There are numerous 2-Fish present after basics, but none of them crack the puzzle. However, a Skyscraper and a finned X-Wing combined will do the trick. What's needed for a single stepper is a larger fish ... or its X-Chain equivalent.

daj95376 wrote:There are numerous 2-Fish present after basics, but none of them crack the puzzle. However, a Skyscraper and a finned X-Wing combined will do the trick. What's needed for a single stepper is a larger fish ... or its X-Chain equivalent.

A fast and easy analysis of the set of candidates for the digit 1 shows that there is only one solution for that digit (after basics) !Another interpretation using fish : Swordfish(1R19C5) : r9c2=r9c9-r1c9=*Kite[R1C5 : r1c1=*r1c4-r23c5=r8c5] --> r9c2=r1c1=r8c5 :=> -1r8c1